﻿// Copyright (c) 2010. Eric Nelson  
// https://code.google.com/p/prompts/
// All rights reserved.
//     
// Redistribution and use in source and binary forms,   
// with or without modification, are permitted provided   
// that the following conditions are met:    
// * Redistributions of source code must retain the   
// above copyright notice, this list of conditions and   
// the following disclaimer.    
// * Redistributions in binary form must reproduce   
// the above copyright notice, this list of conditions   
// and the following disclaimer in the documentation   
// and/or other materials provided with the distribution.    
// * Neither the name of Eric Nelson nor the   
// names of its contributors may be used to endorse   
// or promote products derived from this software   
// without specific prior written permission.    
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND   
// CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,   
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF   
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE   
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR   
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,   
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,   
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR   
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS   
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,   
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING   
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE   
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF   
// SUCH DAMAGE.
// 
//     
// [This is the BSD license, see  
// http://www.opensource.org/licenses/bsd-license.php]  
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;

namespace Prompts.Prompting.ViewModels.Implementation
{
    public class MultiSelectHierarchy : MultiSelectPrompt<ITreeNode>
    {
        public MultiSelectHierarchy(
            string name,
            string label,
            ObservableCollection<ITreeNode> availableItems,
            ObservableCollection<ITreeNode> selectedItems)
            : base(label, name, selectedItems)
        {
            AvailableItems = availableItems;
        }

        public override IEnumerable<ITreeNode> SelectedAvailableItems
        {
            get
            {
                var items = new List<ITreeNode>();
                foreach (var availableItem in AvailableItems)
                {
                    if (availableItem.IsSelected)
                    {
                        items.Add(availableItem);
                    }
                    AddSelectedChildren(availableItem, items);
                }
                return items;
            }
            set { throw new NotImplementedException(); }
        }

        private static void AddSelectedChildren(ITreeNode availableItem, ICollection<ITreeNode> items)
        {
            if(availableItem.Children != null)
            {
                foreach (var child in availableItem.Children)
                {
                    if (child.IsSelected)
                    {
                        items.Add(child);
                    }
                    AddSelectedChildren(child, items);
                }
            }
        }
    }
}